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【单选题】
关于抽象类叙述正确的是?A.
抽象类不能实现接口
B.
抽象类必须有“abstract class”修饰
C.
抽象类必须包含抽象方法抽
D.
抽象类也有类的特性，可以被实例化
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反馈参考答案：
举一反三
【判断题】A majority of Americans now consider themselves part of the religious, politically conservative movement.
A.
正确
B.
错误
【简答题】When I began teaching in a university, I was invited to a workshop for new professors. I had ____ a long time learning what to teach, but not learning how to ____ it. Somehow, my university seemed to ...
【单选题】Though invited several times, I still have some doubt ___ I can go to his birthday party. [ ]
A.
when
B.
where
C.
why
D.
whether
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